Koch J20/C110B Jupiter Junior Guitar Amplifier – 20W Combo, 10” Jensen Speaker, ATR & Reverb

The Koch J20/C110B Jupiter Junior is a powerful and versatile 20W combo guitar amplifier from Koch's renowned Jupiter Series. This compact amplifier delivers authentic tube dynamics and response thanks to the ATR (Authentic Tube Response) concept, featuring a 12AX7 tube in both the preamp and power stages. The Jupiter Junior is equipped with a high-quality 10" Jensen Falcon speaker that delivers a rich, dynamic tone, from clear clean to powerful overdrive.

The amplifier offers three switchable channels: Cool (clean), Hot (overdrive), and Hot Gain Boost. Each channel has its own volume or gain control and shares a three-band tone control. The built-in reverb is based on a classic spring emulation and adds extra depth to your sound. With features like a dimmer (continuously adjustable from 0 to 20 watts), a speaker on/off switch, and a recording output with speaker emulation, the J20 is also perfect for silent practice and studio recording.

Specifications:

• Type: Combo guitar amplifier
• Power: 20W (infinitely variable)
• Technology: Hybrid ATR (Authentic Tube Response)
• Tubes: 1x 12AX7 (preamp), 1x 12AX7 (power amplifier)
• Speaker: 1x 10” Jensen Falcon C10-40
• Channels: 3 (Cool, Hot, Hot Boost – via footswitch)
• Regulations:
• Cool channel: Volume
• Hot channel: Gain & Volume
• Tone Controls: Bass, Mid, Treble (shared)
• Reverb: Spring emulation with volume control
• Effect loop: Buffered, serial
• Speaker on/off switch for silent recording
• Recording out with passive speaker emulation
• Output for external speaker
• Included: 2-way footswitch
• Dimensions: 45 x 42 x 23.5 cm
• Weight: approx. 12 kg

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